/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements.  See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License.  You may obtain a copy of the License at
*
*     http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/

package com.wxiwei.office.fc.hslf.record;

import java.io.IOException;
import java.io.OutputStream;

import com.wxiwei.office.fc.util.LittleEndian;


/**
 * This class represents the metadata of a link in a slide/notes/etc.
 * It normally just holds a InteractiveInfoAtom, with the metadata
 *  in it.
 * @author Nick Burch
 */
public class InteractiveInfo extends RecordContainer
{
    private byte[] _header;
    private static long _type = 4082;

    // Links to our more interesting children
    private InteractiveInfoAtom infoAtom;

    /** 
     * Returns the InteractiveInfoAtom of this InteractiveInfo
     */
    public InteractiveInfoAtom getInteractiveInfoAtom()
    {
        return infoAtom;
    }

    /** 
     * Set things up, and find our more interesting children
     */
    protected InteractiveInfo(byte[] source, int start, int len)
    {
        // Grab the header
        _header = new byte[8];
        System.arraycopy(source, start, _header, 0, 8);

        // Find our children
        _children = Record.findChildRecords(source, start + 8, len - 8);
        findInterestingChildren();
    }

    /**
     * Go through our child records, picking out the ones that are
     *  interesting, and saving those for use by the easy helper
     *  methods.
     */
    private void findInterestingChildren()
    {
        // First child should be the InteractiveInfoAtom
        if (_children[0] instanceof InteractiveInfoAtom)
        {
            infoAtom = (InteractiveInfoAtom)_children[0];
        }
        else
        {
            throw new IllegalStateException(
                "First child record wasn't a InteractiveInfoAtom, was of type "
                    + _children[0].getRecordType());
        }
    }

    /**
     * Create a new InteractiveInfo, with blank fields
     */
    public InteractiveInfo()
    {
        _header = new byte[8];
        _children = new Record[1];

        // Setup our header block
        _header[0] = 0x0f; // We are a container record
        LittleEndian.putShort(_header, 2, (short)_type);

        // Setup our child records
        infoAtom = new InteractiveInfoAtom();
        _children[0] = infoAtom;
    }

    /**
     * We are of type 4802
     */
    public long getRecordType()
    {
        return _type;
    }

    /**
     * 
     */
    public void dispose()
    {
        _header = null;
        if (infoAtom != null)
        {
            infoAtom.dispose();
            infoAtom = null;
        }
    }
}
